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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8644c222ab5437baf9f442ea06c374ec7882ddab47c13760ee50db7b7f6549ca' 
  AND token = 'qjG9jdL3fwyUfbvGDh5Pov3ySBlU2skOxfqs4vtLDWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}